Nate,
This is the precise reason why many of the fuel pump cages on cars are either missing or "butchered"; it was because of the fuel pump replacement. Rather than do the job properly and change the cage/cover too, thrifty owners and mechanics started taking metal cutting tools to the otherwise sanguine older fuel pump cover, or worse, throw it out completely. Yes, I was a victim too.
George Des has been offering advice and even parts on rebuilding fuel pumps, so before you invest in an expensive new style pump, you might investigate this and preserve the integrity of your fuel pump cover and also avoid the pitfalls of not having the right adapter brackets and mounting parts.